Adapter assembly for powered circular stapling device

Abstract

A surgical stapling device includes a handle assembly, an adapter assembly, and a tool assembly. The adapter assembly includes a proximal housing, a distal housing, a proximal mount assembly, a clamping mechanism, and a firing mechanism. The proximal mount assembly is supported in a proximal portion of the proximal housing and includes first and second drive rods. The clamping mechanism includes a firing gear that is coupled to the first and second drive rods such that the clamping mechanism can be driven by two motors supported within the handle assembly. The clamping mechanism and the firing mechanism are adapted to facilitate rotation of the distal housing in relation to the proximal housing.

Description

ADAPTER ASSEMBLY FOR POWERED CIRCULAR STAPLING DEVICECROSS-REFERENCE TO RELATED APPLICATION(S)

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 555,947, filed February 21, 2024, which is incorporated herein by reference in its entirety.FIELD

[0002] This disclosure is directed to surgical stapling devices and, more particularly, to powered surgical stapling devices with removable adapter assemblies.BACKGROUND

[0003] Circular stapling devices are used to perform a variety of anastomoses procedures in which two tubular anatomical tissues structures are joined together. These procedures include colorectal circular anastomosis, esophageal circular anastomosis, and bariatric circular anastomosis. Typically, a circular stapling device includes an adapter assembly that has a proximal portion that is releasably connectable to a handle assembly or actuator of the stapling device and a distal portion that is connectable to a tool assembly of the stapling device.

[0004] Circular stapling devices are available in manual and powered configurations. Typically, the handle assembly of powered circular stapling devices includes one or more motors that drive the clamping and firing mechanisms to actuate the stapling device and electrical circuitry that includes controllers that control operation of the stapling device, and the adapter assembly includes transmission assemblies that convert rotary motor output to longitudinal movement of the clamping and firing mechanisms. Due to higher costs of the components of handle assembly and the adapter assembly, the handle assembly and adapter assembly of powered stapling devices are often configured to be reusable and must be properly sterilized after each use.

[0005] Due to the complexities of the components of the adapter assembly, it has been difficult and costly to manufacture an adapter assembly that can be adequately sterilized to facilitate reuse. Accordingly, a continuing need exists for a powered circular stapling device having an adapter assembly that can be manufactured in a cost-effective manner to allow for disposal.SUMMARY

[0006] This disclosure is directed to a surgical stapling device that includes a handle assembly, an adapter assembly, and a tool assembly. The adapter assembly includes a proximal housing, a distal housing, a proximal mount assembly, a clamping mechanism, and a firing mechanism. The proximal mount assembly is supported in a proximal portion of the proximal housing and includes first and second drive rods. The clamping mechanism includes a firing gear that is coupled to the first and second drive rods of the proximal mount assembly such that the clamping mechanism is driven by two motors supported within the handle assembly to split the load between the two motors. The clamping mechanism and the firing mechanism are adapted to facilitate rotation of the distal housing in relation to the proximal housing.

[0007] Aspects of this disclosure are directed to an adapter assembly for a surgical stapling device that includes a proximal mount assembly, a clamping mechanism, and a firing mechanism. The proximal mount assembly includes a mounting block, a first drive rod, a second drive rod, a first gear, and a second gear. The mounting block defines a first channel, a second channel, and a third channel, and the second channel receives the first drive rod, and the third channel receives the second drive rod. The first drive rod has a distal portion that supports the first gear, and the second drive rod has a distal portion that supports the second gear. The clamping mechanism includes a clamp screw, a clamp lead nut, trocar bands, and a trocar that is configured to releasably couple to an anvil assembly of the stapling device. The clamp screw is received within the first channel of the mounting block and is adapted to be coupled to a first motor of the stapling device. The clamp screw has a first threaded surface, and the clamp lead nut includes a second threaded surface that is engaged with the first threaded surface of the clamp screw such that rotation of the clamp screw causes longitudinal movement of the clamp lead nut. The clamp lead nut has a distal portion that is coupled to a proximal portion of the trocar bands to translate longitudinal movement of the clamp lead nut to longitudinal movement of the trocar bands. The trocar bands have a distal portion that is fixedly coupled to a proximal portion of the trocar such that longitudinal movement of the trocar bands causes longitudinal movement of the trocar. The firing mechanism includes a firing gear, a firing link, a firing lead nut, and a pusher link. The firing gear is engaged with the first gear and the second gear such that rotation of the first or second drive rods causes rotation of the firing gear. The firing gear is engaged with the firing link to translate rotation of the firing gear to rotation of the firing link. The firing link includes a third threaded surface, and the firing leadnut includes a fourth threaded surface that is engaged with the third threaded surface such that rotation of the firing link causes longitudinal movement of the firing lead nut. The firing lead nut has a distal portion that is engaged with a proximal portion of the pusher link to translate longitudinal movement of the firing lead nut to longitudinal movement of the pusher link, and the pusher link has a distal portion that is adapted to be coupled to a pusher of a cartridge assembly of the stapling device. The first drive rod is adapted to be coupled to a second motor of the stapling device and the third drive rod is adapted to be coupled to a third motor of the stapling device such that the firing gear is driven by the first and second motors.

[0008] In aspects of the disclosure, the adapter assembly includes a proximal housing and a distal housing, the proximal housing has a proximal portion fixedly secured to the proximal mount assembly and a distal portion, and the distal housing has a proximal portion rotatably coupled to the distal portion of the proximal housing.

[0009] In some aspects of the disclosure, the clamping mechanism includes a clamp nut link having a proximal portion rotatably coupled to the clamp lead nut and a distal portion fixedly coupled to the trocar bands.

[0010] In certain aspects of the disclosure, the proximal housing defines a stepped longitudinal bore having a shoulder, the firing link has a distally facing annular shoulder, and the adapter assembly includes a thrust bearing positioned between the shoulder of the proximal housing and the distally facing annular shoulder of the firing link.

[0011] In aspects of the disclosure, a strain gauge is positioned between the thrust bearing and the shoulder of the proximal housing.

[0012] In some aspects of the disclosure, the firing gear defines a proximally facing circular cavity that is defined by an inner circular side wall that defines gear teeth that are engaged by the first gear and the second gear of the proximal mount assembly at spaced locations on the inner circular side wall of the firing gear.

[0013] In certain aspects of the disclosure, the firing gear defines a distally facing hexagonal cavity and the firing link includes a head having a hexagonal configuration that is received in the distally facing hexagonal cavity of the firing gear.

[0014] In aspects of the disclosure, the proximal portion of the clamp screw includes an annular flange, and the adapter assembly includes a thrust bearing positioned between the firing gear and the annular flange.

[0015] In some aspects of the disclosure, the firing gear defines a central through bore that receives the clamp screw, and the adapter assembly includes a bearing that is positioned about the clamp screw and received within the central through bore of the of the firing gear.

[0016] In certain aspects of the disclosure, the proximal portion of the distal housing defines an annular channel, and the distal portion of the proximal housing includes an annular projection that is received within the annular channel to rotatably couple the distal housing to the proximal housing.

[0017] In aspects of the disclosure, the annular projection of the distal portion of the proximal housing includes an inner surface that defines a concavity.

[0018] Other aspects of the disclosure are directed to a surgical stapling device including a handle assembly, an adapter assembly, and a tool assembly. The handle assembly includes a housing that defines a cavity, a first motor, a second motor, and a third motor that are received within the cavity of the housing. The adapter assembly has a proximal portion that is coupled to the handle assembly and a distal portion and includes a proximal mount assembly, a clamping mechanism, and a firing mechanism. The proximal mount assembly includes a mounting block, a first drive rod, a second drive rod, a first gear, and a second gear. The mounting block defines a first channel, a second channel, and a third channel, and the second channel receives the first drive rod, and the third channel receives the second drive rod. The first drive rod has a distal portion that supports the first gear, the second drive rod has a distal portion that supports the second gear, and the first drive rod is coupled to the second motor and the second drive rod is coupled to the third motor. The clamping mechanism includes a clamp screw, a clamp lead nut, trocar bands, and a trocar that has a distal portion. The clamp screw is received within the first channel of the mounting block and is coupled to the first motor. The clamp screw has a first threaded surface, and the clamp lead nut includes a second threaded surface that is engaged with the first threaded surface of the clamp screw such that rotation of the clamp screw causes longitudinal movement of the clamp lead nut. The clamp lead nut has a distal portion that is coupled to a proximal portion of the trocar bands to translate longitudinal movement of the clamp lead nut to longitudinal movement of the trocar bands, and the trocar bands have distal portions that are fixedly coupled to a proximal portion of the trocar such that longitudinal movement of the trocar bands causes longitudinal movement of the trocar. The firing mechanism includes a firing gear, a firing link, a firing lead nut, and a pusher link. The firing gear is engaged with the first gear and the second gear such that rotation of thefirst or second drive rods causes rotation of the firing gear. The firing gear is engaged with the firing link to translate rotation of the firing gear to rotation of the firing link. The firing link includes a third threaded surface, and the firing lead nut includes a fourth threaded surface that is engaged with the third threaded surface such that rotation of the firing link causes longitudinal movement of the firing lead nut. The firing lead nut has a distal portion that is engaged with a proximal portion of the pusher link to translate longitudinal movement of the firing lead nut to longitudinal movement of the pusher link, and the pusher link has a distal portion that is adapted to be coupled to a pusher of a cartridge assembly of the stapling device. The tool assembly includes an anvil assembly and a cartridge assembly, and the anvil assembly is releasably coupled to the trocar of the clamping mechanism. The cartridge assembly includes a shell housing, a staple cartridge, staples, and a staple pusher. The staple cartridge is supported on the shell housing and defines staple receiving pockets that receive the staples. The pusher is movable within the shell housing from a retracted position to an advanced position to eject the staples from the staple cartridge, and the pusher has a proximal portion that is coupled to the pusher link.

[0019] Other aspects of the disclosure are directed to an adapter assembly for a surgical stapling device that includes a proximal mount assembly, a clamping mechanism, and a firing mechanism. The proximal housing has a proximal portion and a distal portion, the distal housing has a proximal portion and a distal portion, and the proximal portion of the distal housing is rotatably coupled to the distal portion of the proximal housing. The proximal mount assembly includes a mounting block, a first drive rod, and a first gear. The mounting block defines a first channel and a second channel. The clamping mechanism includes a clamp screw, a clamp lead nut, a clamp nut link, trocar bands, and a trocar. The trocar is configured to releasably couple to an anvil assembly of the stapling device. The clamp screw is received within the first channel of the mounting block and is adapted to be coupled to a first motor of the stapling device. The clamp screw has a first threaded surface, and the clamp lead nut includes a second threaded surface that is engaged with the first threaded surface of the clamp screw such that rotation of the clamp screw causes longitudinal movement of the clamp lead nut. The clamp lead nut has a distal portion that is rotatably coupled to a proximal portion of the clamp nut link, and the clamp nut link has a distal portion that is fixedly coupled to the proximal portion of the trocar bands to translate longitudinal movement of the clamp lead nut to longitudinal movement of the trocar bands. The trocar bands have distal portions that are fixedly coupled to a proximal portion of the trocar such thatlongitudinal movement of the trocar bands causes longitudinal movement of the trocar. The firing mechanism includes a firing gear, a firing link, a firing lead nut, and a pusher link. The firing gear is engaged with the first gear such that rotation of the first drive rod causes rotation of the firing gear. The firing gear is engaged with the firing link to translate rotation of the firing gear to rotation of the firing link. The firing link includes a third threaded surface, and the firing lead nut includes a fourth threaded surface that is engaged with the third threaded surface such that rotation of the firing link causes longitudinal movement of the firing lead nut. The firing lead nut has a distal portion that is engaged with a proximal portion of the pusher link to translate longitudinal movement of the firing lead nut to longitudinal movement of the pusher link, and the pusher link has a distal portion adapted to be coupled to a pusher of a cartridge assembly of the stapling device.

[0020] Other features of the disclosure will be appreciated from the following description.BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various aspects of the disclosure are described herein below with reference to the drawings, wherein:

[0022] FIG. 1 is a side perspective view of one version a stapling device according to aspects of the disclosure with a tool assembly in an unclamped position;

[0023] FIG. 2 is a side perspective, exploded view of the adapter assembly and cartridge assembly of the stapling device shown in FIG. 1 ;

[0024] FIG. 2A is a side perspective view of a clamping mechanism of the stapling device shown in FIG. 1 ;

[0025] FIG. 2B is a side perspective view of a firing mechanism of the stapling device shown in FIG. 1;

[0026] FIG. 3 is a side perspective view of an adapter assembly of the stapling device shown in FIG. 1 with a cartridge assembly supported on a distal portion of the adapter assembly;

[0027] FIG. 4 is a side perspective view of a proximal portion of the adapter assembly shown in FIG. 3 with a distal housing and a portion of a proximal housing removed;

[0028] FIG. 5 is a perspective view from the proximal end of the adapter assembly shown inFIG. 2 with the distal housing and the proximal housing shown in phantom illustrating a proximal portion of the firing and clamping mechanisms of the stapling device;

[0029] FIG. 6 is an enlarged view of the indicated area of detail shown in FIG. 2;

[0030] FIG. 7 is an enlarged view of the indicated area of detail shown in FIG. 2;

[0031] FIG. 8 is a cross-sectional view taken along section line 8-8 of FIG. 3;

[0032] FIG. 9 is an enlarged view of the indicated area of detail shown in FIG. 8;

[0033] FIG. 10 is an enlarged view of the indicated area of detail shown in FIG. 8;

[0034] FIG. 11 is a cross-sectional view taken along section line 11-11 of FIG. 8;

[0035] FIG. 12 is an enlarged view of the indicated area of detail shown in FIG. 11;

[0036] FIG. 13 is an enlarged view of the indicated area of detail shown in FIG. 11;

[0037] FIG. 14 is side perspective view from the distal end of a firing nut of the firing mechanism of the adapter assembly shown in FIG. 2;

[0038] FIG. 15 is side perspective view of a clamping nut of the clamping mechanism of the adapter assembly shown in FIG. 2;

[0039] FIG. 16 is a side perspective view of a clamp link of the clamping mechanism of the adapter assembly shown in FIG. 2;

[0040] FIG. 17 is an enlarged view of the indicated area of detail shown in FIG. 2;

[0041] FIG. 18 is a side perspective view from the distal end of a firing gear and firing link of the firing mechanism of the adapter assembly shown in FIG. 2;

[0042] FIG. 19 is a cross-sectional view taken along section line 19-19 of FIG. 12;

[0043] FIG. 20 is a cross-sectional view taken along section line 20-20 of FIG. 9;

[0044] FIG. 21 is a side perspective view of the stapling device shown in FIG. 1 as the distal portion of the adapter assembly is rotated about a longitudinal axis defined by the proximal portion of the adapter assembly;

[0045] FIG. 22 is a cross-sectional view taken along section line l- l of FIG. 21;

[0046] FIG. 23 is a side perspective view of the tool assembly of the stapling device shown inFIG. 1 as the tool assembly moves to the clamped position;

[0047] FIG. 24 is a cross-sectional view taken through the proximal portion of the adapter assembly as the clamping mechanism is actuated to move the tool assembly to the clamped position;

[0048] FIG. 25 is an enlarged view of the indicated area of detail shown in FIG. 24;

[0049] FIG. 26 is a cross-sectional view taken through the proximal portion of the adapter assembly as the firing mechanism is actuated to fire staples and cut tissue; and

[0050] FIG. 27 is an enlarged view of the indicated area of detail shown in FIG. 26;DETAILED DESCRIPTION

[0051] The disclosed circular stapling device will now be described in detail with reference to the drawings in which like reference numerals designate identical or corresponding elements in each of the several views. However, it is to be understood that aspects of the disclosure are merely exemplary of the disclosure and may be embodied in various forms. Well-known functions or constructions are not described in detail to avoid obscuring the disclosure in unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the disclosure in virtually any appropriately detailed structure.

[0052] In this description, the term “proximal” is used generally to refer to that portion of the device that is closer to a clinician during use of the device for its intended purpose, while the term “distal” is used generally to refer to that portion of the device that is farther from the clinician during use of the device for its intended purpose. In addition, the terms “about” and “substantially” are intended to include a range that includes the listed parameter and plus or minus ten percent of the listed parameter. Further, the term “clinician” is used generally to refer to medical personnel including doctors, nurses, and support personnel.

[0053] This disclosure is directed to a surgical stapling device that includes a handle assembly, an adapter assembly, and a tool assembly. The adapter assembly includes a proximal housing, a distal housing, a proximal mount assembly, a clamping mechanism, and a firing mechanism. The proximal mount assembly is supported in a proximal portion of the proximal housing and includes first and second drive rods. The clamping mechanism includes a firing gear that is coupled to the first and second drive rods such that the clamping mechanism can be driven by two motors supported within the handle assembly to split the load between the two motors. The clamping mechanism and the firing mechanism are adapted to facilitate rotation of the distal housing and tool assembly in relation to the proximal housing.

[0054] FIG. 1 illustrates a circular stapling device according to aspects of the disclosure shown generally as stapling device 10 which includes a handle assembly or actuator 12, an adapter assembly 14, and a tool assembly 16. The handle assembly 12 includes a housing 18 that forms a stationary handle 18a and defines a cavity that receives internal components (not shown) of the handle assembly 12 which include batteries, motors Ml, M2, and M3 (FIG. 5), and electrical circuitry (not shown). The handle assembly 12 includes actuator buttons 22 for activating clamping and firing mechanisms of the stapling device 10. The adapter assembly 14 includes a proximalportion 14a that is releasably coupled to the handle assembly 12 and a distal portion 14b that supports the tool assembly 16. In aspects of the disclosure, the tool assembly 16 includes a cartridge assembly 24 and an anvil assembly 26. The anvil assembly 26 is releasably coupled to the adapter assembly 14 as described below and is movable in relation to the cartridge assembly between an unclamped position (FIG. 1) and a clamped position (FIG. 23).

[0055] FIG. 2 illustrates the cartridge assembly 24 of the tool assembly 16 which is supported on the distal portion 14b of the adapter assembly 14 and includes a shell housing 30, a staple pusher 32, an annular knife 34, a staple cartridge 36, and staples 38. The shell housing 30 defines a cavity 40, and the staple pusher 32 is movable within the cavity 40 between a pusher retracted position and a pusher advanced position. The knife 34 is supported on an inner periphery of the staple pusher 32 and projects distally of the staple pusher 32. The staple cartridge 36 is received within the distal portion of the cavity 40 of the shell housing 30 and defines an annular array of staple receiving pockets 42 (FIG. 1) that receive the staples 38. The staple pusher 32 has a distal portion that defines fingers 32a that are received within and movable through the staple receiving pockets 42 (FIG. 1) when the staple pusher 32 moves from the pusher retracted position to the pusher advanced position to eject the staples 38 from the staple cartridge 36 into the anvil assembly 26. The staple pusher 32 includes connectors 44 that facilitate coupling to a firing mechanism of the stapling device 10 (FIG. 10) described in further detail below. The shell housing 30 also supports a cylindrical bushing 46 that extends through the shell housing 30 and receives a trocar 48 of a clamping mechanism 56 (FIG. 2A) described in further detail below.

[0056] FIGS. 2-3 illustrate the adapter assembly 14 of the stapling device 10 which includes a distal housing 50, a proximal housing 52, a proximal mount assembly 54, a clamping mechanism 56 (FIG. 2A), and a firing mechanism 58 (FIG. 2B). The proximal mounting assembly 54 includes a proximal mounting block 60, a distal mounting block 62, a first drive rod 64, a first drive coupler 66, a second drive rod 68, a second drive coupler 70, and a latching member 72. The proximal mounting block 60 is fixedly secured to the distal mounting block 62 and defines with the distal mounting block 62 three spaced longitudinal channels including a first channel 74, a second channel 76, and a third channel 78. The first channel 74 is centrally located in the proximal and distal mounting blocks 60, 62. The second and third channels 76, 78 are spaced outwardly from the first channel 74. The second channel 76 receives the first drive rod 64 and the third channel 78receives the second drive rod 68. The first drive coupler 66 is rotatably fixed to a proximal portion of the first drive rod 64 and is positioned in the proximal portion of the second channel 76. Similarly, the second drive coupler 70 is rotatably fixed to a proximal portion of the second drive rod 68 and is positioned in the proximal portion of the third channel 78. In aspects of the disclosure, the first and second drive couplers 66, 70 are urged towards the proximal ends of the second and third channels 76, 78 by springs 80.

[0057] The proximal mounting block 60 is configured to be received within a recess (not shown) formed in the distal portion of the handle assembly 12 to couple the proximal portion of the adapter assembly 14 to the distal portion of the handle assembly 12. The latching member 72 is supported on the proximal mounting block 60 and is configured to engage the handle assembly 12 to releasably secure the adapter assembly 14 to the handle assembly 12. In aspects of the disclosure, the latching member 72 is biased towards a latched position by a spring 72a. When the adapter assembly 14 is coupled to the handle assembly 12, the couplers 66, 70 are engaged with motors M2 and M3 respectively (FIG. 5) supported within the handle assembly 12 such that activation of the motors M2 and M3 causes rotation of the first drive rod 64 and the second drive rod 68. The first drive rod 64 has a distal end that supports a first gear 84 and the second drive rod has a distal end that supports a second gear 86.

[0058] The proximal housing 52 (FIG. 2) defines a stepped longitudinal bore that has a large diameter portion 88 that receives the proximal mount assembly 54 and a small diameter portion 90 that receives portions of the clamping mechanism 56 (FIG. 2A) and firing mechanism 58 (FIG. 2B). The large diameter portion 88 defines an annular shoulder 92 that supports a secondary thrust bearing 94 and a strain gauge 96 that is positioned between the secondary thrust bearing 94 and the annular shoulder 92 of the proximal housing 52. The strain gauge 96 is coupled to circuitry within the handle assembly 12 by a suitable conductor (not shown) to control operation of the stapling device 10. The proximal portion of the large diameter portion 88 includes inwardly extending tabs 99 (FIG. 4) that engage the proximal mount assembly 54 to fixedly secure the proximal mount assembly 54 within the large diameter portion 88 of the proximal housing 52. In aspects of the disclosure, the proximal housing 52 is formed from half-sections 52a and 52b that are secured together using any suitable fastening technique, e.g., sonic welding, screws etc.

[0059] The distal portion (FIG. 7) of the proximal housing 52 includes an inner annular projection 100 that is received within an annular channel 102 of the distal housing 50 to rotatablycouple the distal housing 50 to the proximal housing 52. In aspects of the disclosure, the inner surface of the annular projection 100 is curved to define a concavity 100a (FIG. 10) between the annular projection 100 and the outer surface of the distal housing 50 (FIG. 10). The inner surface 110 of the proximal housing 52 includes ribs 104 that frictionally engage the outer surface of the distal housing 50 to releasably retain the distal housing 50 in a selected rotational orientation in relation to the proximal housing 52. In aspects of the disclosure, the proximal portion of the distal housing 50 includes openings 106 (FIG. 6) that partially receive the ribs 104 to retain the rotational orientation of the distal housing 50 in relation to the proximal housing 52. In some aspects of the disclosure, a sleeve 105 is positioned about the joint between the distal housing 50 and the proximal housing 52. In certain aspects of the disclosure, the proximal housing 52 is substantially linear and defines a longitudinal axis “X” (FIG. 1), and the distal housing 50 is curved and rotates about the longitudinal axis “X”.

[0060] FIGS. 2, 2A and 8-16 illustrate the clamping mechanism 56 of the adapter assembly 14 of the stapling device 10 (FIG. 1) which includes a clamp screw 112, a clamp lead nut 114, a clamp nut link 116, trocar bands 118, and the trocar 48. The clamp screw 112 includes a proximal portion that extends through the central channel 74 of the distal mounting block 62 and the proximal mounting block 60 and is engaged with a third drive coupler 120 (FIG. 5). The third drive coupler 120 is urged towards the proximal portion of the central channel 74 of the proximal block 60 by a spring 122 and is positioned to be coupled to a motor Ml (FIG. 5) supported within the handle assembly 12 (FIG. 1) such that activation of the motor Ml causes rotation of the clamp screw 112. The clamp screw 112 includes an annular flange 112a that is engaged with a spacer 113a. The spacer 113a is engaged with a primary thrust bearing 113a that is positioned between the spacer and a firing gear 160 of the firing mechanism 58 to distribute clamping forces from the clamp screw 112 through the firing link 162 and the secondary thrust bearing 94 to the proximal housing 52.

[0061] The clamp screw 112 includes a threaded portion 124 that extends distally from the proximal mount assembly 54 and is received within a threaded bore 126 defined in the proximal portion of the clamp lead nut 114 (FIG. 15). The clamp lead nut 114 defines a longitudinal channel 128 that communicates with the threaded bore 126. The distal portion of the clamp lead nut 114 is rotatably coupled to a proximal portion of the clamp nut link 116 (FIG. 16). In aspects of the disclosure, the distal portion of the clamp lead nut 114 defines transverse bores 130 that receivecircular discs 132 formed on the proximal portion of the clamp lead nut 114 to rotatably couple the clamp nut link 116 to the distal portion of the clamp lead nut 114. The clamp lead nut 114 includes a flat surface 134 (FIG. 15) that prevents rotation of the clamp lead nut 114 within the proximal housing 52 as described below.

[0062] The distal portion of the clamp nut link 116 of the clamping mechanism 56 defines a longitudinally extending slot 140 and a transverse through bore 142 that extends through the slot 140. The slot 140 receives proximal portions of the trocar bands 118, and the transverse through bore 142 receives a pin 144 that fixedly secures the proximal portions of the trocar bands 118 to the clamp nut link 116. In aspects of the disclosure, the clamp nut link 116 defines an annular channel 116a (FIG. 2A) that receives an O-ring 116b (FIG. 10). The O-ring 116b provides sealing between the outer surface of the clamp nut link 116 and an inner surface of the pusher link 166. In aspects of the disclosure, each of the trocar bands 118 is formed of a flexible material and defines proximally located bores 146 that receive the pin 144. Each of the trocar bands 118 has a distal portion that defines longitudinally spaced bores 148. The distal portions of the trocar bands 118 are received within a longitudinally extending slot 150 defined in a proximal portion of the trocar 48 to fixedly secure the trocar bands 118 to the trocar 48. In aspects of the disclosure, the proximal portion of the trocar 48 defines transverse bores 152 that receive pins 154 that extend through the bores 146 of the trocar bands 118 to fixedly secure the trocar bands 118 to the trocar 48.

[0063] When the clamp screw 112 is rotated by the motor Ml (FIG. 5) supported within the handle assembly 12 (FIG. 1), engagement between the threaded portion 124 of the clamp screw 112 and the threaded bore 126 of the clamp lead nut 114 causes longitudinal movement of the clamp lead nut 114 within the proximal housing 52. Longitudinal movement of the clamp lead nut 114 causes longitudinal movement of the clamp nut link 116 and longitudinal movement of the trocar bands 118 and the trocar 48. In some aspects of the disclosure, the distal portion of each of the trocar bands 118 has a width that is smaller than the width of the proximal portion of the trocar band 118, and the proximal portion of each of the trocar bands 118 is supported between curved guide sleeves 156 (FIG. 2) that are positioned within the distal housing 50 and support movement of the trocar bands 118 through the curved portion of the distal housing 50. The trocar 48 is configured to be releasably coupled to the anvil assembly 26 such that longitudinal movement of the trocar 48 causes longitudinal movement of the anvil assembly 26 in relation to the cartridge assembly 24.

[0064] FIGS. 2, 2B, 5, 9, and 13-20 illustrate the firing mechanism 58 of the adapter assembly 14 which includes a firing gear 160, a firing link 162, a fire lead nut 164, and a pusher link 166. The firing gear 160 and the firing link 162 are illustrated in FIGS. 17 and 18. The firing gear 160 has a cylindrical configuration and defines a central through bore 168, a proximally facing circular cavity 170 (FIG. 17), and a distally facing hexagonal cavity 172 (FIG. 18). The central through bore 168 of the firing gear 160 receives the clamp screw 112 and a bearing 174 that is rotatably supported about a proximal portion of the clamp screw 112 such that the firing gear 160 is rotatable about the proximal portion of the clamp screw 112. The circular proximally facing cavity 170 is defined by an inner circular side wall 176 that defines gear teeth 177 that extend around the central through bore 168.

[0065] The firing link 162 defines a circular through bore 163 that receives the clamp screw 112 and includes a cylindrical body portion 178 and a head 180 that is formed or supported on a proximal end of the cylindrical body portion 178. The head 180 of the firing link 162 has a hexagonal configuration and is received within the distally facing hexagonal cavity 172 of the firing gear 160 to secure the firing link 162 to the firing gear 160. The head 180 of the firing link 162 defines a proximally facing stepped bore 182 (FIG. 17) that receives a portion of the bearing 174 to rotatably support the proximal portion of the firing link 162 on the clamp screw 112. The head 180 of the firing link 162 also includes a distally facing annular shoulder 181 (FIG. 18) that engages the secondary thrust bearing 94 within the proximal housing 52. The cylindrical body portion 178 of the firing link 162 includes a distal portion that includes outer screw threads 184 (FIG. 18).

[0066] FIG. 14 illustrates the fire lead nut 164 which includes a cylindrical proximal portion 186, a U-shaped central portion 188, and a square distal portion 190. Alternately, the fire lead nut 164 can have different configurations. The cylindrical proximal portion 186 includes internal threads 192 and receives the distal portion of the firing link 162 such that the internal threads 192 of the fire lead nut 164 engage the external threads 184 of the firing link 162. The clamp screw 112 and the clamp lead nut 114 extend through the fire lead nut 164. The central portion 188 of the fire lead nut 164 defines an internal flat 198 (FIG. 20) that engages the flat surface 134 of the clamp lead nut 114 of the clamping mechanism 56 to prevent rotation of the clamp lead nut 114 within the fire lead nut 164. The distal portion of the fire lead nut 164 abuts the proximal end of the pusher link 166 such that distal movement of the fire lead nut 164 causes distal movement ofthe pusher link 166. The distal portion of the pusher link 166 is secured to the staple pusher 32 such that distal movement of the pusher link 166 causes distal movement of the staple pusher 32 to advance the staple pusher 32 and the knife 34 (FIG. 2) within the shell housing 30, eject the staples 38 from the staple cartridge 36, and cut tissue clamped between the staple cartridge 36 and the anvil assembly 26. In aspects of the disclosure, the distal portion of the pusher link 166 includes flexible tabs 200 that receive the connectors 44 (FIG. 2) of the staple pusher 32 to couple the pusher link 166 to the staple pusher 32.

[0067] In some aspects of the disclosure, a biasing member 202 (FIG. is positioned between a shoulder 204 formed on the proximal portion of the distal housing 50 and a shoulder 206 formed on the proximal portion of the pusher link 166 to urge the pusher link 166 and the staple pusher 32 towards retracted positions. In certain aspects of the disclosure, the pusher link 166 defines diametrically opposed cutouts 208 (FIG. 2B) that receive the guide sleeves 156 of the clamp mechanism 56. In other aspects of the disclosure, the pusher link 166 defines an annular groove 166a (FIG. 2B) that receives an annular seal, e.g., an O-ring 167, that provides a seal between the pusher link 166 and the distal housing 50.

[0068] FIG. 5 illustrates the proximal portion of the firing mechanism 58. As illustrated, the gear 84 of the first drive rod 64 and the gear 86 of the second drive rod 68 are engaged with the gear teeth 177 of the firing gear 160. As described above, when the firing gear 160 rotates, the firing link 162 rotates with the firing gear 160 to advance the fire lead nut 164 which is threadedly engaged with the firing link 162. When the fire lead nut 164 is advanced, the distal end of the fire lead nut 164 which abuts the proximal portion of the pusher link 166 advances the pusher link 166 to advance the staple pusher 32 within the shell housing 30 of the cartridge assembly 24. In aspects of the disclosure, the first drive rod 64 is driven by a motor M2 (FIG. 5) supported within the handle assembly 12 (FIG. 1) and the second drive rod 68 is driven by a motor M3 supported within the handle assembly 12 such that the power required to rotate the firing gear 160 is divided between the two motors M2 and M3.

[0069] FIGS. 21 and 22 illustrate the stapling device 10 as the distal housing 50 is rotated manually by a clinician in relation to the proximal housing 52 in the direction indicated by arrow “A”. To rotate the distal housing 50 in relation to the proximal housing 52, the clinician grasps the handle assembly 12 in one hand and the distal housing 50 with the other hand and rotates the distal housing 50 in a desired direction to rotate the cartridge assembly 24 about the longitudinal axis“X” of the proximal housing 52. When the clinician rotates the distal housing 50, the proximal portion of the distal housing 50 rotates within the distal portion of the proximal housing 52. When the distal housing 50 rotates within the proximal housing 52, the openings 106 in the proximal portion of the distal housing 50 move in relation to the ribs 104 on the inner surface of distal portion of the proximal housing 52. As the distal housing 50 rotates, the clamp nut link 116 (FIG. 2A) of the clamping mechanism 56 rotates in relation to the clamp lead nut 114 of the clamping mechanism 56 to allow the trocar bands 118 and the trocar 48 to rotate with the distal housing 50. As described above, the pusher link 166 of the firing mechanism 58, which is confined within the distal housing 50 and is coupled to the pusher 32 within the cartridge assembly 24, is in abutting relation with the fire lead nut 164 and rotates with the distal housing 50 in relation to the fire lead nut 164. The cartridge assembly 24 is coupled to the pusher link 166 and rotates with the distal housing 50.

[0070] FIGS. 22-24 illustrate the adapter assembly as the stapling device 10 (FIG. 1) is activated to move the anvil assembly 26 from the unclamped position (FIG. 1) to the clamped position (FIG. 23). When the clamp screw 112 of the clamping mechanism 56 is rotated in the direction indicated by arrow “B” by the motor Ml (FIG. 5), the threaded portion 124 of the clamp screw 112 which is engaged within the threaded bore 126 of the clamp lead nut 114 pulls the clamp lead nut 114 proximally in the direction indicated by arrow “C” in FIGS. 24 and 25 to pull the trocar bands 118 and the trocar 48 proximally in the direction indicated by arrow “D” to move the anvil assembly 26 proximally in the direction indicated by arrows “E” in FIG. 23 from the unclamped position to the clamped position. The forces generated by the clamping mechanism 56 are distributed through the clamp screw 112, the spacer 113, the thrust bearing 113a and the firing link 162 to the secondary thrust bearing 94 and the proximal housing 52.

[0071] FIGS. 26 and 27 illustrate the adapter assembly as the stapling device 10 (FIG. 1) is activated to eject the staples 38 (FIG. 2) from the staple cartridge 36 of the cartridge assembly 24 into the anvil assembly 26. When the stapling device 10 (FIG. 1) is activated to fire the staples 38 and advance the knife 34, the motors M2 and M3 are activated to rotate the drive rods 64 and 68. The drive rods 64, 68 are coupled to the first and second gears 84, 86 which are engaged with the gear teeth 177 of the firing gear 160 such that rotation of the drive rods 64, 68 rotates the firing gear 160. The firing gear 160 is fixedly coupled to the firing link 162 such that rotation of the firing gear 160 causes the firing link 162 to rotate in the direction indicated by arrow “F”. Whenthe firing link 162 rotates in the direction of arrow “F”, the threads 184 on the firing link 162 which are engaged with the threads 192 on the fire lead nut 164 cause the fire lead nut 164 to advance in the direction of arrow “G”. As described above, the fire lead nut 164 is in abutting relation to the pusher link 166 such that longitudinal advancement of the fire lead nut 164 is advanced in the direction of arrow “H” to advance the pusher 32 within the shell housing 30 of the cartridge assembly 24 to eject staples 38 from the staple cartridge 36 and advance the knife 34 to cut tissue clamped between the staple cartridge 36 and the anvil assembly 26.

[0072] In aspects of the disclosure, the cartridge assembly 24 is fixedly secured to the distal housing 50 of the adapter assembly 14. After the stapling device 10 is fired, the adapter assembly 14 can be disengaged from the handle assembly 12, the anvil assembly 26 can be disengaged from the trocar 48, and the adapter assembly 14 and cartridge assembly 24 can be disposed of in an appropriate manner.

[0073] Persons skilled in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary aspects of the disclosure. It is envisioned that the elements and features illustrated or described in connection with one exemplary aspects of the disclosure may be combined with the elements and features of other aspects of the disclosure without departing from the scope of the disclosure. One skilled in the art will appreciate further features and advantages of the disclosure based on the above-described aspects of the disclosure. Accordingly, the disclosure is not to be limited by what has been particularly shown and described, except as indicated by the appended claims.

[0074] The following examples are illustrative of the techniques described herein.

[0075] Example 1. An adapter assembly for a surgical stapling device, the adapter assembly comprising: a proximal mount assembly including a mounting block, a first drive rod, a second drive rod, a first gear, and a second gear, the mounting block defining a first channel, a second channel, and a third channel, the second channel receiving the first drive rod and the third channel receiving the second drive rod, the first drive rod having a distal portion supporting the first gear, and the second drive rod having a distal portion supporting the second gear; a clamping mechanism including a clamp screw, a clamp lead nut, trocar bands, and a trocar, the trocar configured to releasably couple to an anvil assembly of the stapling device, the clamp screw received within the first channel of the mounting block and adapted to be coupled to a first motorof the stapling device, the clamp screw having a first threaded surface and the clamp lead nut including a second threaded surface that is engaged with the first threaded surface of the clamp screw such that rotation of the clamp screw causes longitudinal movement of the clamp lead nut, the clamp lead nut having a distal portion coupled to a proximal portion of the trocar bands to translate longitudinal movement of the clamp lead nut to longitudinal movement of the trocar bands, the trocar bands having distal portions that are fixedly coupled to a proximal portion of the trocar such that longitudinal movement of the trocar bands causes longitudinal movement of the trocar; and a firing mechanism including a firing gear, a firing link, a firing lead nut, and a pusher link, the firing gear engaged with the first gear and the second gear such that rotation of the first or second drive rods causes rotation of the firing gear, the firing gear engaged with the firing link to translate rotation of the firing gear to rotation of the firing link, the firing link including a third threaded surface and the firing lead nut including a fourth threaded surface that is engaged with the third threaded surface such that rotation of the firing link causes longitudinal movement of the firing lead nut, the firing lead nut having a distal portion engaged with a proximal portion of the pusher link to translate longitudinal movement of the firing lead nut to longitudinal movement of the pusher link, and the pusher link having a distal portion adapted to be coupled to a pusher of a cartridge assembly of the stapling device, wherein the first drive rod is adapted to be coupled to a second motor of the stapling device and the third drive rod is adapted to be coupled to a third motor of the stapling device such that the firing gear is driven by the first and second motors.

[0076] Example 2. The adapter assembly of example 1, further including a proximal housing and a distal housing, the proximal housing having a proximal portion fixedly secured to the proximal mount assembly and a distal portion, and the distal housing having a proximal portion rotatably coupled to the distal portion of the proximal housing.

[0077] Example s. The adapter assembly of example 2, wherein the clamping mechanism includes a clamp nut link having a proximal portion rotatably coupled to the clamp lead nut and a distal portion fixedly coupled to the trocar bands.

[0078] Example 4. The adapter assembly of example 3, wherein the proximal housing defines a stepped longitudinal bore having a shoulder, and the firing link has a distally facing annular shoulder, the adapter assembly further including a thrust bearing positioned between the shoulder of the proximal housing and the distally facing annular shoulder of the firing link.

[0079] Example 5. The adapter assembly of example 4, further including a strain gauge positioned between the thrust bearing and the shoulder of the proximal housing.

[0080] Example 6. The adapter assembly of example 1 , wherein the firing gear defines a proximally facing circular cavity that is defined by an inner circular side wall that defines gear teeth that are engaged by the first gear and the second gear of the proximal mount assembly at spaced locations on the inner circular side wall of the firing gear.

[0081] Example 7. The adapter assembly of example 6, wherein the firing gear defines a distally facing hexagonal cavity and the firing link includes a head having a hexagonal configuration that is received in the distally facing hexagonal cavity of the firing gear.

[0082] Example 8. The adapter assembly of example 7, wherein the proximal portion of the clamp screw includes an annular flange, and the adapter assembly includes a thrust bearing positioned between the firing gear and the annular flange.

[0083] Example 9. The adapter assembly of example 8, wherein the firing gear defines a central through bore that receives the clamp screw, and the adapter assembly includes a bearing that is positioned about the clamp screw and received within the central through bore of the of the firing gear.

[0084] Example 10. The adapter assembly of example 2, wherein the proximal portion of the distal housing defines an annular channel, and the distal portion of the proximal housing includes an annular projection, the annular projection received within the annular channel to rotatably couple the distal housing to the proximal housing.

[0085] Example 11. The adapter assembly of example 10, wherein the annular proj ection of the distal portion of the proximal housing includes an inner surface that defines a concavity.

[0086] Examplel2. A surgical stapling device comprising: a handle assembly including a housing defining a cavity, a first motor, a second motor, and a third motor, the first motor, the second motor, and the third motor received within the cavity of the housing; an adapter assembly having a proximal portion coupled to the handle assembly and a distal portion, the adapter assembly including: a proximal mount assembly including a mounting block, a first drive rod, a second drive rod, a first gear, and a second gear, the mounting block defining a first channel, a second channel, and a third channel, the second channel receiving the first drive rod and the third channel receiving the second drive rod, the first drive rod having a distal portion supporting the first gear, and the second drive rod having a distal portion supporting the second gear, the firstdrive rod coupled to the second motor and the second drive rod coupled to the third motor; a clamping mechanism including a clamp screw, a clamp lead nut, trocar bands, and a trocar, the trocar having a distal portion, the clamp screw received within the first channel of the mounting block and coupled to the first motor, the clamp screw having a first threaded surface and the clamp lead nut including a second threaded surface that is engaged with the first threaded surface of the clamp screw such that rotation of the clamp screw causes longitudinal movement of the clamp lead nut, the clamp lead nut having a distal portion coupled to a proximal portion of the trocar bands to translate longitudinal movement of the clamp lead nut to longitudinal movement of the trocar bands, and the trocar bands having distal portions that are fixedly coupled to a proximal portion of the trocar such that longitudinal movement of the trocar bands causes longitudinal movement of the trocar; and a firing mechanism including a firing gear, a firing link, a firing lead nut, and a pusher link, the firing gear engaged with the first gear and the second gear such that rotation of the first or second drive rods causes rotation of the firing gear, the firing gear engaged with the firing link to translate rotation of the firing gear to rotation of the firing link, the firing link including a third threaded surface and the firing lead nut including a fourth threaded surface that is engaged with the third threaded surface such that rotation of the firing link causes longitudinal movement of the firing lead nut, the firing lead nut having a distal portion engaged with a proximal portion of the pusher link to translate longitudinal movement of the firing lead nut to longitudinal movement of the pusher link, and the pusher link having a distal portion adapted to be coupled to a pusher of a cartridge assembly of the stapling device; and a tool assembly including an anvil assembly and a cartridge assembly, the anvil assembly releasably coupled to the trocar of the clamping mechanism, the cartridge assembly including a shell housing, a staple cartridge, staples, and a staple pusher, the staple cartridge supported on the shell housing and defining staple receiving pockets that receive the staples, the pusher movable within the shell housing from a retracted position to an advanced position to eject the staples from the staple cartridge, the pusher having a proximal portion coupled to the pusher link.

[0087] Example 13. The surgical stapling device of example 12, wherein the pusher supports an annular knife, the knife movable with the pusher as the pusher moves from the retracted position to the advanced position.

[0088] Example 14. The surgical stapling device of example 12, wherein the adapter assembly includes a proximal housing and a distal housing, the proximal housing having aproximal portion fixedly secured to the proximal mount assembly and a distal portion, and the distal housing having a proximal portion rotatably coupled to the distal portion of the proximal housing, wherein the clamping mechanism includes a clamp nut link having a proximal portion rotatably coupled to the clamp lead nut and a distal portion fixedly coupled to the trocar bands.

[0089] Example 15. The surgical stapling device of example 14, wherein the proximal housing defines a stepped longitudinal bore having a shoulder, and the firing link has a distally facing annular shoulder, the adapter assembly further including a thrust bearing and a strain gauge, the thrust bearing positioned between the shoulder of the proximal housing and the distally facing annular shoulder of the firing link, and the strain gauge positioned between the thrust bearing and the shoulder of the proximal housing.

[0090] Example 16. The surgical stapling device of example 12, wherein the firing gear defines a proximally facing circular cavity and a distally facing hexagonal cavity, the proximal facing circular cavity defined by an inner circular side wall that defines gear teeth that are engaged by the first gear and the second gear of the proximal mount assembly at spaced locations on the inner circular side wall of the firing gear, and the firing link includes a head having a hexagonal configuration that is received in the distally facing hexagonal cavity of the firing gear.

[0091] Example 17. The surgical stapling device of example 12, wherein the proximal portion of the clamp screw includes an annular flange, and the adapter assembly includes a thrust bearing positioned between the firing gear and the annular flange.

[0092] Example 18. The surgical stapling device of example 12, wherein the firing gear defines a central through bore that receives the clamp screw, and the adapter assembly includes a bearing that is positioned about the clamp screw and received within the central through bore of the of the firing gear.

[0093] Example 19. The surgical stapling device of example 14, wherein the proximal portion of the distal housing defines an annular channel, and the distal portion of the proximal housing includes an annular projection, the annular projection received within the annular channel to rotatably couple the distal housing to the proximal housing.

[0094] Example 20. An adapter assembly for a surgical stapling device, the adapter assembly comprising: a proximal housing having a proximal portion and a distal portion, and a distal housing having a proximal portion and a distal portion, the proximal portion of the distal housing rotatably coupled to the distal portion of the proximal housing; a proximal mountassembly including a mounting block, a first drive rod, and a first gear, the mounting block defining a first channel and a second channel; a clamping mechanism including a clamp screw, a clamp lead nut, a clamp nut link, trocar bands, and a trocar, the trocar configured to releasably couple to an anvil assembly of the stapling device, the clamp screw received within the first channel of the mounting block and adapted to be coupled to a first motor of the stapling device, the clamp screw having a first threaded surface and the clamp lead nut having a second threaded surface that is engaged with the first threaded surface of the clamp screw such that rotation of the clamp screw causes longitudinal movement of the clamp lead nut, the clamp lead nut having a distal portion rotatably coupled to a proximal portion of the clamp nut link, and the clamp nut link having a distal portion fixedly coupled to a proximal portion of the trocar bands to translate longitudinal movement of the clamp lead nut to longitudinal movement of the trocar bands, the trocar bands having distal portions that are fixedly coupled to a proximal portion of the trocar such that longitudinal movement of the trocar bands causes longitudinal movement of the trocar; and a firing mechanism including a firing gear, a firing link, a firing lead nut, and a pusher link, the firing gear engaged with the first gear of the proximal mount assembly such that rotation of the first drive rod causes rotation of the firing gear, the firing gear engaged with the firing link to translate rotation of the firing gear to rotation of the firing link, the firing link including a third threaded surface and the firing lead nut including a fourth threaded surface that is engaged with the third threaded surface such that rotation of the firing link causes longitudinal movement of the firing lead nut, the firing lead nut having a distal portion engaged with a proximal portion of the pusher link to translate longitudinal movement of the firing lead nut to longitudinal movement of the pusher link, and the pusher link having a distal portion adapted to be coupled to a pusher of a cartridge assembly of the stapling device.

Claims

WHAT IS CLAIMED IS:

1. An adapter assembly (14) for a surgical stapling device (10), the adapter assembly (14) comprising: a proximal mount assembly (54) including a mounting block (60), a first drive rod (64), a second drive rod (68), a first gear (84), and a second gear (86), the mounting block (60) defining a first channel (74), a second channel (76), and a third channel (78), the second channel (76) receiving the first drive rod (64) and the third channel (78) receiving the second drive rod (68), the first drive rod (64) having a distal portion supporting the first gear (84), and the second drive rod (68) having a distal portion supporting the second gear (86); a clamping mechanism (56) including a clamp screw (112), a clamp lead nut (114), trocar bands (118), and a trocar (48), the trocar (48) configured to releasably couple to an anvil assembly (26) of the surgical stapling device (10), the clamp screw (112) received within the first channel (74) of the mounting block (60) and adapted to be coupled to a first motor (Ml) of the surgical stapling device, the clamp screw (112) having a first threaded surface and the clamp lead nut (114) including a second threaded surface that is engaged with the first threaded surface of the clamp screw (112) such that rotation of the clamp screw (112) causes longitudinal movement of the clamp lead nut (114), the clamp lead nut (114) having a distal portion coupled to a proximal portion of the trocar bands (118) to translate longitudinal movement of the clamp lead nut (114) to longitudinal movement of the trocar bands (118), the trocar bands (118) having distal portions that are fixedly coupled to a proximal portion of the trocar (48) such that longitudinal movement of the trocar bands (118) causes longitudinal movement of the trocar (48); and a firing mechanism (58) including a firing gear (160), a firing link (162), a fire lead nut (164), and a pusher link (166), the firing gear (160) engaged with the first gear (84) and the second gear (86) such that rotation of the first drive rod (64) or the second drive rod (68) causes rotation of the firing gear (160), the firing gear (160) engaged with the firing link (162) to translate rotation of the firing gear (160) to rotation of the firing link (162), the firing link (162) including a third threaded surface and the fire lead nut (164) including a fourth threaded surface that is engaged with the third threaded surface such that rotation of the firing link (162) causes longitudinal movement of the fire lead nut (164), the fire lead nut (164) having a distal portion engaged with a proximal portion of the pusher link (166) to translate longitudinal movement of the fire lead nut(164) to longitudinal movement of the pusher link (166), and the pusher link (166) having a distal portion adapted to be coupled to a pusher (32) of a cartridge assembly (24) of the surgical stapling device (10), wherein the first drive rod (64) is adapted to be coupled to a second motor (M2) of the surgical stapling device (10) and the third drive rod is adapted to be coupled to a third motor (M3) of the surgical stapling device (10) such that the firing gear ( 160) is driven by the first motor (Ml ) and the second motor (M2).

2. The adapter assembly (14) according to claim 1, further including a proximal housing (52) and a distal housing (50), the proximal housing (52) having a proximal portion fixedly secured to the proximal mount assembly (54) and a distal portion, and the distal housing (50) having a proximal portion rotatably coupled to the distal portion of the proximal housing (52).

3. The adapter assembly (14) according to any of the preceding claims, wherein the clamping mechanism (56) includes a clamp nut link (116) having a proximal portion rotatably coupled to the clamp lead nut (114) and a distal portion fixedly coupled to the trocar bands (118).

4. The adapter assembly (14) according to any of the preceding claims, wherein the proximal housing (52) defines a stepped longitudinal bore having a shoulder (92), and the firing link (162) has a distally facing annular shoulder (181), the adapter assembly (14) further including a thrust bearing (94) positioned between the shoulder (92) of the proximal housing (52) and the distally facing annular shoulder (181) of the firing link (162).

5. The adapter assembly (14) of claim 4, further including a strain gauge (96) positioned between the thrust bearing (94) and the shoulder (92) of the proximal housing (52).

6. The adapter assembly (14) according to any of the preceding claims, wherein the firing gear (160) defines a proximally facing circular cavity (170) that is defined by an inner circular side wall (176) that defines gear teeth (177) that are engaged by the first gear (84) and the second gear (86) of the proximal mount assembly (54) at spaced locations on the inner circular side wall (176) of the firing gear (160).

7. The adapter assembly (14) according to any of claims 4-6, wherein the firing gear (160) defines a distally facing hexagonal cavity (172) and the firing link (162) includes a head (180) having a hexagonal configuration that is received in the distally facing hexagonal cavity (172) of the firing gear (160).

8. The adapter assembly according to any of the preceding claims, wherein the proximal portion of the clamp screw (112) includes an annular flange (112a), and the adapter assembly (14) includes a thrust bearing (113a) positioned between the firing gear (160) and the annular flange (112a).

9. The adapter assembly (14) according to any of the preceding claims, wherein the firing gear (160) defines a central through bore (168) that receives the clamp screw (112), and the adapter assembly (14) includes a bearing (174) that is positioned about the clamp screw (112) and received within the central through bore (168) of the of the firing gear (160).

10. The adapter assembly (14) according to claim 2, wherein the proximal portion of the distal housing (50) defines an annular channel, and the distal portion of the proximal housing (52) includes an annular projection, the annular projection received within the annular channel to rotatably couple the distal housing (50) to the proximal housing (52).

11. The adapter assembly (14) of claim 10, wherein the annular projection of the distal portion of the proximal housing (52) includes an inner surface that defines a concavity.

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